Make simulation progress meter configurable

[rogeriojorge]

Summary

• expose Diffrax's progress_meter through simulation
• use NoProgressMeter by default to avoid host callbacks in batch, profiling, and differentiated runs
• retain opt-in meters such as TqdmProgressMeter

The simplified PR changes one source file with seven additions and four deletions; it does not add a test for a directly visible function default.

Validation

• pytest -q: 3 passed
• 65x65 Fourier, 6x6x6 Hermite Orszag--Tang fixed-step smoke benchmark completed with both NoProgressMeter and TqdmProgressMeter
• fresh-process compile-plus-run times were 9.802 s and 9.845 s respectively; this PR does not claim a material JIT-time improvement

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
spectrax/_simulation.py	100.00% <100.00%> (ø)

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